How NASA keeps the James Webb Space Telescope colder than deep space

To capture the universe's oldest light, the James Webb Space Telescope must operate at extreme temperatures. This talk explores the engineering behind the cryocooler, a critical system that chills the Mid-Infrared Instrument to near absolute zero, enabling the telescope's most sensitive observations.

Launched in 2021, the James Webb Space Telescope relies on a specialized cryocooler to function. Because the telescope studies infrared light, its instruments must be kept at incredibly low temperatures to prevent their own heat from interfering with data collection. The cryocooler achieves this by cooling the Mid-Infrared Instrument (MIRI) to below 7 kelvins, equivalent to -447 degrees Fahrenheit.

Dr. Konstantin Penanen, the lead for the JWST/MIRI cryocooler at NASA's Jet Propulsion Laboratory, explains the mechanics required to reach these near-absolute-zero conditions. This technology is essential for the telescope to produce the high-resolution images that have been released since the mission began.

Source: A Cold Universe: The James Webb Space Telescope, MIRI, and the Cryocooler (Live Public Talk)